Malicious PDF — malware analysis report

Static analysis result for SHA-256 39779b22d2b84533…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 02:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e2deb4b29c7f20c791174ed783f1337 SHA-1: 0d6b48a98818a750bbd07320320cbec759eb43e4 SHA-256: 39779b22d2b8453325308cc6c3dee75b1a69224a25e21733463c4ac2e897c965
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using link farms to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=stomatitis+venenata+pdf PDF link annotation
    • http://caycanh.vn/images/fck/file/94726400985.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1ebe78b0---99001502480.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/23067707619.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ca81e97a9e3---tebefagelamijetototepika.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/25932265042.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/mugurido.pdfIn PDF document text
    • http://prestopc.it/upload/file/rusiwajolenixe.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/87753946710.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/bfa02cecf05938f2e050d802d12a15c5/nirozigekujitimutekob.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/41926233593.pdfIn PDF document text
    • https://argumentua.com/i/file/mutawe.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/biwetixemapogifamibo.pdfIn PDF document text
    • https://megashina24.ru/files/files/tamunimimutajufaroxifat.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/89718166995.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5f379183204ebdf21f47b46874637389/somiwonikaj.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ea9efc97a65541dd80d908548cfa551/vamamevipadafowul.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/45425677925.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/6807193348.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/10804687098.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6b6ed623---40764464145.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/53992290045.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/487894412fb5d68984e201cb1a052d2e/54755573025.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624293211.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/60345361072.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE3 10652 bytes
SHA-256: e62c3406bed017769ca5a873585cbeb240d5516bde5a93e0c97132e7445b6072
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 15980 bytes
SHA-256: ca0d87622355b0d05563871ab20f14d40662a1193228f3997c510b06dfcff181

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